Perseus Digital Libraryevolving digital library of resources for the study of the humanities Collaborators initially formed the project to construct a large, heterogeneous collection of materials, textual and visual, on the Archaic and Classical Greek world. The project has expanded into other areas of the humanities adding tools for more languages, a variety of collections, and new types of materials. The classical foundation has paved the way for literary and historical collections ranging from the English Renaissance to the American Civil War, and Greek tools became a foundation for the development of resources in Latin, Italian, and Arabic. Recent expansions include ancient science, Roman materials, Greek lexicography, an on-line edition of the works of Christopher Marlowe, in Education & Referencewith historylanguageliteraturereferenceby 19 users